Etude comparative des tetrahydro- et -deuteroaluminates de lithium LiAlH4, LiAlD4. III - Caracterisation de la variete γ haute pression
作者： Jean-Pierre Bastide , Jean-Claude Bureau , Jean-Marie Létoffé , Pierre Claudy
DOI: 10.1016/0025-5408(87)90069-9
关键词: Crystal structure 、 Phase (matter) 、 Physical chemistry 、 Ambient pressure 、 Phase diagram 、 Mineralogy 、 Volume (thermodynamics) 、 Raman spectroscopy 、 High pressure 、 Chemistry 、 Octahedron
摘要: Abstract The γ-crystalline form of LiAlH 4 (or LiAlD ) has been obtained at high pressure using a belt type apparatus. γ-phase is quenched and studied ambient pressure. crystalline structure redeterminated. On the basis Raman spectra an octahedral environment Al 3+ proposed. α → γ transition reflected in change CN Li + from to 6, important decrease volume ( ⋍30 % ). Upon warming, transforms into α-form with large endothermal effect, as expected for true hig phase. From these results, tentative (P,T) phase diagram
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